Relicts of Neo-Tethyan mantle wedge in the Indo-Burma Range, India: Record of carbonate metasomatism and Neo-Tethyan mantle evolution

Kingson, Oinam; Liu, Yongsheng; Bhutani, Rajneesh; Widdowson, Mike

doi:10.1016/j.rines.2023.100001

Cited by 5 publications

(3 citation statements)

References 147 publications

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“…A fully nonlinear inversion is applied to determine the causative body by inverting ground deformations and gravity variations due to pressure and mass anomalies implanted into an elastic medium. Impressive outcomes are in volcanic environments, where ground deformations by seismic sequences are associated with over-pressured magmatic geobodies (Camacho et al, 2020;Cammarata et al, 2018;Cintorrino et al, 2019;Dhawale et al, 2023;Kianoush et al, 2023e;Kianoush et al, 2024;Kianoush et al, 2023b;Kingson et al, 2023;Kwami et al, 2023;Palano et al, 2023;Pirhadi et al, 2023). In this research, a 1-D inversion problem, also known as the pseudo-well problem, has been investigated.…”

Section: Introductionmentioning

confidence: 99%

Estimating elastic properties of sediments by pseudo-wells generation utilizing simulated annealing optimization method

Khah,

Salehi,

Kianoush

et al. 2024

Preprint

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The hydrate concentration model considerably affects elastic properties, including bulk and shear modulus. Defining seismic properties of sediments, such as compressional and shear wave velocity and density, provides valuable information to identify rock facies and fluid types. This information commonly results from pre-stack seismic inversion, while post-stack seismic information provides acoustic impedance as a layer-based property. Traditionally, seismic inversion requires well logs to produce an initial guess of inversion routines and provide a low-frequency part of the amplitude spectrum. Eventually, seismic inversion methods could not be performed in the areas without well-log data, such as deep sea areas. In such cases, pseudo-well logs derived from pre-stack seismic data are a solution. Pseudo-well generation is a title used to estimate the elastic parameters of sediments in areas, such as deep marine environments, where drilled wells are absent or sparse. Metaheuristic optimization algorithms are suitable tools for minimizing the cost function as they best match real and synthetic seismic data. In this study, the SEAM earth model has been used as a reference to investigate the quality of pseudo-well generation utilizing a simulated annealing (SA) algorithm as an optimization method of property model change, which minimizes the cost function of seismic inversion. As a result, considering an initial model type of the SEAM model, simultaneous seismic inversion introduced the best compressional and shear wave velocities and density logs, which provide the best real and synthetic seismic data match when synthetic data is calculated from the simplified Zoeppritz equation.

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Section: Introductionmentioning

confidence: 99%

Estimating elastic properties of sediments by pseudo-wells generation utilizing simulated annealing optimization method

Khah,

Salehi,

Kianoush

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

“…A fully nonlinear inversion is applied to determine the causative body by inverting ground deformations and gravity changes due to pressure and mass anomalies embedded into an elastic medium. Interesting results are in volcanic environments, where ground deformations by seismic sequences are related to over-pressured magmatic bodies (Camacho et al, 2020;Cammarata et al, 2018;Cintorrino et al, 2019;Dhawale et al, 2023;Kianoush et al, 2023b;Kingson et al, 2023;Palano et al, 2023). The rock physics model links the physical parameters with elastic properties and can serve as a constraint for seismic methods (Chen et al, 2023;Yuan et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Estimation of elastic properties of sediments utilizing simulated annealing algorithm – a pseudo-wells generation approach

Khah,

Salehi,

Kianoush

et al. 2023

Preprint

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The gas hydrate distribution model containing cement, or un-cement models, considerably affects elastic properties such as shear and bulk modulus. Thus, determining the distribution model in the hydrate-bearing sediments requires decreasing uncertainty in quantitative studies based on seismic velocities. Pre-stack seismic data include additional fluid information than post-stack seismic data, and the pre-stack inversion procedure has influential benefits such as stable outcomes, high resolution, and strong manageability. The amplitude-variation-with-angle (AVA) inversion along the bottom simulating reflector (BSR) utilizing compressional and Shear wave pre-stack analysis could be involved to evaluate hydrate and gas saturations at the pseudo well, especially in accretionary prism structures. It could change unconsolidated sediments' elastic properties and produce sharp bottom simulating. Pseudo-well generation is a title for estimating the elastic parameters of sediments in areas such as deep marine environments where drilled wells are absent (or sparse). This seismic angle-gather inversion problem has complex space and several local and global optimum solutions. In such cases, metaheuristic algorithms are a suitable tool for problem-solving. In this paper, the metaheuristic Simulated Annealing algorithm has been investigated, and the developed optimized algorithm has been presented. In order to analyze the performance of the algorithm, pre-stack seismic data is utilized as a benchmark. The conceptual model of this data includes the elastic parameter logs, which makes it an appropriate option for analyzing the performance and accuracy of the algorithm. According to the results, the generation of pseudo-wells with the algorithm mentioned earlier can be used to characterize hydrates-bearing sediments.

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“…Consequently, a numerical approach shall be considered to solve for these unknowns under specific initial and boundary conditions. Advanced numerical schemes, e.g., the finite element method, are suitable for solving complex geomechanical problems (Ebrahimabadi et al, 2015;Hosseini et al, 2023a;Hosseini et al, 2023b;Kianoush et al, 2023c;Kingson et al, 2023;Mackerle, 1999;Motahari et al, 2022;Palano et al, 2023;Rafieepour et al, 2020;Tao and Ghassemi, 2007;Zalnezhad et al, 2022). Regardless, the finite element method is time-consuming and computationally expensive.…”

Section: Introductionmentioning

confidence: 99%

Wellbore Stability in a Depleted Reservoir by Finite Element Analysis of Coupled thermo-poro-elastic Units in an Oilfield, SW Iran

Pirhadi,

Kianoush,

Ebrahimabadi

et al. 2023

Preprint

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Maintaining wellbore stability in depleted reservoirs is a critical problem. With production from hydrocarbon reservoirs, the pore pressure of the reservoir is reduced over time, and the reservoir is depleted since field development is one of the main purposes for oil companies. Heavy mud weight in depleted reservoir caused fracture due to reduced fracture gradient, and low mud weight caused blow out in high-pressure zone or well collapse due to shale beds that required high mud weight to prevent collapse. Considering geomechanics and coupled equilibrium equation, continuity equation, Hook’s law, compatibility equation, Darcy’s law, and thermal relation, the Thermo-poro-elastic equation was derived in this research. A finite element method has been developed to implement the fully coupled thermo-poro-elastic non-linear models. The finite element model was validated by comparing it to the available analytical solutions for the thermo-poro-elastic wellbore problems in shale. The non-linear thermal-poro-elasticity finite element model was used to analyze wellbore stability in a depleted limestone reservoir during drilling. The numerical results showed that a decrease drilling fluid’s temperature (cooling) causes to increase in the potential for tensile failure and reduces the potential of shear failure. Due to the depletion reservoir, the potential of tensile failure increased than shear failure, so heating the drilling fluid could cause wellbore stability in the depleted reservoir. Furthermore, based on the numerical results, it may be concluded that the drilling fluid’s temperature is one of the important factors in the wellbore stability analysis in depleted reservoirs.

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Relicts of Neo-Tethyan mantle wedge in the Indo-Burma Range, India: Record of carbonate metasomatism and Neo-Tethyan mantle evolution

Cited by 5 publications

References 147 publications

Estimating elastic properties of sediments by pseudo-wells generation utilizing simulated annealing optimization method

Estimating elastic properties of sediments by pseudo-wells generation utilizing simulated annealing optimization method

Estimation of elastic properties of sediments utilizing simulated annealing algorithm – a pseudo-wells generation approach

Wellbore Stability in a Depleted Reservoir by Finite Element Analysis of Coupled thermo-poro-elastic Units in an Oilfield, SW Iran

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